WO2010092782A1

WO2010092782A1 - Underground outer wall structure

Info

Publication number: WO2010092782A1
Application number: PCT/JP2010/000737
Authority: WO
Inventors: 坂本俊彦; 中山裕章; 原田典佳
Original assignee: 新日本製鐵株式会社
Priority date: 2009-02-10
Filing date: 2010-02-08
Publication date: 2010-08-19
Also published as: JPWO2010092782A1

Abstract

An underground outer wall structure provided with a first steel sheet pile and a second steel sheet pile which are connected together at joint sections each provided to each side edge of each of the steel sheet piles and which are installed in the ground to separate the ground side and the basement space side from each other, and the underground outer wall structure is also provided with a connecting member joined to both the first steel sheet pile and the second steel sheet pile so as to bridge the joint sections on the basement space side thereof. The connecting member is disposed so as to extend in the direction of installation of the first steel sheet pile and the second steel sheet pile in the ground.

Description

Underground wall structure

The present invention relates to an underground outer wall structure. The present invention particularly relates to an underground outer wall structure provided with a wall body made of a plurality of steel sheet piles.
This application claims priority based on Japanese Patent Application No. 2009-028769 filed in Japan on February 10, 2009, the contents of which are incorporated herein by reference.

Conventionally, reinforced concrete underground outer walls (hereinafter referred to as RC walls) are frequently used as underground outer walls of buildings and the like. As a procedure for constructing such an RC wall, underground excavation is performed using a temporary earth retaining wall with a continuous underground wall such as a main pile lateral sheet pile or a soil cement wall, and then the RC wall is placed inside the excavated temporary earth retaining wall. The construction method is generally common. In such a construction method of the underground outer wall, the temporary earth retaining material is not expected as a structure of the underground outer wall and is pulled out or buried after the RC wall is constructed. Therefore, there is an inconvenience that the construction cost increases and the construction period becomes longer.

In order to improve such an inconvenience, a technique has been proposed in which the temporary earth retaining material is used as a structure of the underground outer wall by a composite structure in which the temporary earth retaining material and the RC wall are integrated (for example, Patent Documents). 1 and 2).
In the underground wall structure described in Patent Document 1, a headed stud is attached to a flange of an H-shaped steel, which is a core material embedded in a soil cement wall that is a temporary earth retaining, and this headed stud is embedded in the rear. The H-section steel and the RC wall are connected by constructing the punched RC wall. By connecting the core material of the temporary earth retaining material and the RC wall in this way, the core material and the RC wall integrally resist external forces acting from the outside of the underground outer wall such as earth pressure and water pressure. Can do. That is, the RC wall can be reinforced by the core material, and the core material of the temporary earth retaining material can be used as a part of the structure of the underground outer wall.

Moreover, the technique described in Patent Document 2 relates to a composite structure in which a steel sheet pile, which is one of temporary earth retaining materials, and an RC wall are integrated. In this composite structure, the RC wall and the steel sheet pile are connected via a perforated steel plate gibber fixed to the steel sheet pile. Thus, by using the steel sheet pile as a structure of the underground outer wall, it is not necessary to pull out the steel sheet pile after the RC wall is constructed. In addition, the number of RC walls can be reduced by the amount of reinforcement by the steel sheet pile. Therefore, it is possible to reduce the construction cost and the construction period.

Japanese Patent No. 3578210 Japanese Patent No. 3614087

In the underground outer wall of the conventional composite structure described in

Patent Documents

1 and 2, the core material and steel sheet pile constituting the temporary earth retaining material resist the load acting on the out-of-plane direction as a reinforcing material for the RC wall. However, it cannot resist the in-plane load during an earthquake. For this reason, RC walls are indispensable to resist the in-plane load at the time of an earthquake, and as a conventional underground outer wall structure, an RC wall is constructed after performing underground excavation using temporary earth retaining. Therefore, it cannot be expected that the construction cost will be significantly reduced and the construction period will be shortened.
On the other hand, in order to significantly reduce the cost and the construction period, it is also conceivable to construct the underground outer wall only with a plurality of steel sheet piles without constructing the RC wall in the conventional underground outer wall structure. However, in this case, since the connection part (joint part) between the steel sheet piles is not restrained in the longitudinal direction (vertical direction), the shear force cannot be sufficiently transmitted to the in-plane load at the time of the earthquake. A single underground wall cannot be used as a seismic wall.
Here, as a method of improving the shear strength at the connecting portion of the steel sheet pile, for example, a method of directly welding the connecting portion, a method of welding a round bar in the connecting portion, or the like can be considered. However, in the method of directly welding the connecting portion of the steel sheet pile, the size of the gap portion to be welded differs depending on the fitting state of the connecting portion. Therefore, there is a problem that it is difficult to apply to the construction work because it requires high-level throat thickness management and strength management. Moreover, since the precision of the field welding of the joint part of an adjacent steel sheet pile strongly depends on a welder's technique, quality control is difficult and the safety | security with respect to an earthquake etc. is inadequate.

The purpose of the present invention is to use a joint restraint means that does not require an RC wall to resist the in-plane load during an earthquake and that allows easy construction and strength management so that an underground outer wall can be constructed with a steel sheet pile alone. An object of the present invention is to provide an underground outer wall structure that has a function as a seismic wall, and to provide an underground outer wall structure that can realize significant cost reduction.

The present invention employs the following means in order to solve the above-described problems.
(1) According to one aspect of the present invention, the first steel sheet pile and the second steel sheet are connected to each other by joint portions provided at the respective side edges and embedded in the ground to partition the ground side and the basement space side. An underground outer wall structure comprising: a steel sheet pile; and a connecting member joined to both the first steel sheet pile and the second steel sheet pile so as to straddle the basement space side of the joint portion. The connecting member is provided along the embedding direction of the first steel sheet pile and the second steel sheet pile.
(2) In the underground outer wall structure described in (1) above, the connecting member is a pair of joints joined to each of the first steel sheet pile and the second steel sheet pile; A cover portion covering the basement space side; and a concealing space may be formed between the cover portion and the joint portion.
(3) In the underground outer wall structure described in (2) above, the pair of joints is a welded joint that welds the first steel sheet pile, the second steel sheet pile, and the connecting member, It may be provided continuously along the embedding direction of the first steel sheet pile and the second steel sheet pile, or may be provided intermittently along the embedding direction.
(4) In the underground outer wall structure described in the above (2) or (3), the cover portion may be a steel material having an L-shaped section, a U-shaped section, or a semi-cylindrical section.
(5) In the underground outer wall structure according to any one of (2) to (4), the first steel sheet pile and the second steel sheet pile have a predetermined height position on the basement space side, A drainage groove extending in a direction substantially perpendicular to the embedding direction may be provided, and a lower end portion of the concealing space may be communicated with the drainage groove.
(6) In the underground outer wall structure according to any one of (1) to (5), the first steel sheet pile and the second steel sheet pile are each provided on the basement space side. A flange; a pair of webs connected to both side edges of the first flange; and extending from the leading edge of the pair of webs to be substantially parallel to the first flange and outward and located on the ground side A pair of second flanges, and a hat-shaped steel sheet pile in which the pair of joint portions are provided at the end edges of the pair of second flanges, and the connecting member is joined to the second flange. good.
(7) In the underground outer wall structure according to any one of (1) to (5), the first steel sheet pile and the second steel sheet pile are each provided on the ground side. A pair of webs connected to both side edges of the first flange; provided to extend from the leading edges of the pair of webs substantially parallel to the first flange and outward and located on the basement space side A pair of second flanges, and a hat-shaped steel sheet pile in which the pair of joint portions are provided at the end edges of the pair of second flanges, and the connecting member is joined to the second flange. good.
(8) In the underground outer wall structure according to any one of the above (1) to (5), the first steel sheet pile is provided with a first flange provided on the ground side; A first U-shaped steel sheet pile in which the pair of joint portions are provided at the leading edges of the pair of first webs, A steel sheet pile comprising: a second flange provided on the basement space side; a pair of second webs connected to both side edges of the second flange; and a pair of second webs It is a 2nd U-shaped steel sheet pile in which a pair of above-mentioned joint part is provided in a tip edge, and the above-mentioned connecting member may be joined to the 1st web and the 2nd web.

According to the configuration described in (1) above, the connecting members are joined across the joint portions of the adjacent steel sheet piles, and the steel sheet piles are connected by this connecting member, so that the upper and lower portions in the joint portions of the adjacent steel sheet piles. Relative deformation in the direction (embedding direction), that is, shear deformation between steel sheet piles can be constrained. Therefore, the wall main body in which a plurality of steel sheet piles are connected can sufficiently resist the in-plane shear force, and the wall main body can function as an earthquake-resistant wall. As a result, it is not necessary to construct a conventional RC wall on the inside (space side) of the wall main body made of steel sheet piles, and it becomes possible to significantly reduce the cost and construction period required to construct the RC wall. .
In addition, by providing a connecting member on the front side (underground space side) that straddles the steel sheet pile joint, the joining work of the connecting member can be performed from the front side, and the ground on the front side is excavated after embedding the steel sheet pile Then, the connecting member can be joined later. Therefore, since it is not necessary to provide an extra member protruding from the surface before embedding the steel sheet pile, an increase in embedding resistance of the steel sheet pile can be prevented and good workability can be ensured.

According to the configuration described in (2) above, the joint part can be concealed from the front side by covering the joint part front side (basement space side) of the steel sheet pile with the cover part of the connecting member. For this reason, when the space on the front side is used for a basement or the like, the appearance can be improved without providing a finishing material or the like on the wall body. Furthermore, when there is a back ground on the back side of the wall body, there is a concern that groundwater in this ground may seep out from between the joints to the front side, but it oozed out by covering the joints with the cover part Groundwater can be made invisible from the front side, and in this case, the appearance of the wall body can be improved.

According to the configuration described in (3) above, by joining the connecting member to the steel sheet pile by welding, throat thickness management and strength management during welding can be performed relatively easily and reliably. In other words, the weld joint can be formed in a straight line along the longitudinal direction of the steel sheet pile, and it is only necessary to weld the portion where the connecting member and the steel sheet pile intersect, so the welding rod is inserted straight from the front side in a horizontal posture. Therefore, fillet welding and flare welding that can be easily managed can be employed. Moreover, by providing the weld joint part continuously or intermittently along the longitudinal direction of the steel sheet pile, the weld length and the leg length of the weld part can be appropriately set according to the required shear strength.

According to the configuration described in (4) above, the cover portion is made of a steel material having an L-shaped cross section, a U-shaped cross section, or a semi-cylindrical cross section, so that the open edge of the cover portion and the side surface of the steel sheet pile intersect. As described above, the weld joint can be provided at a position that is linear and easy to work from the front side, and welding management can be performed easily and reliably.

According to the configuration described in (5) above, even if groundwater from the back ground oozes out from between the joints to the front side (basement space side) as described above, this groundwater is transferred from the concealed space to the drainage ditch. It can be guided and drained, and the concealed space can also function as a drainage basin.

Further, according to the configurations described in the above (6) to (8), in the wall body having irregularities by the hat-shaped steel sheet pile or the U-shaped steel sheet pile, the portion recessed from the front side to the back side (ground side) By joining the connecting members, the connecting members can be prevented from protruding to the front side, and the space on the front side can be effectively used. On the other hand, by joining the connecting member to the protrusion protruding to the front side, the connecting member and the drainage groove can be directly connected, and the structure of the connecting portion can be simplified. In addition, it can be suitably selected according to design conditions etc. in which position of a concavity and convexity a connection member is joined.

According to the underground outer wall structure of the present invention as described above, it is possible to constrain the shear deformation at the connecting portion of the steel sheet pile with the connecting member, so it is necessary to construct an RC wall that bears the in-plane load during an earthquake. There will be no steel sheet piles, and it will be possible to construct an underground outer wall by itself. Further, by covering the joint front surface of the steel sheet pile with the connecting member, the groundwater exuded from the rear surface is made invisible from the front surface side, the aesthetic appearance is improved, and the drainage can be led to the drainage groove and drained.

It is sectional drawing which shows the underground outer wall which concerns on embodiment of this invention. It is a cross-sectional view of the same underground outer wall. It is a front view of the underground outer wall. It is a cross-sectional view which expands and shows a part of said underground outer wall. It is a front view which expands and shows a part of said underground outer wall. It is a longitudinal cross-sectional view which expands and shows a part of said underground outer wall. FIG. 4 is an enlarged cross-sectional view showing an underground outer wall having a communication structure different from that shown in FIGS. 3A to 3C. FIG. 3 is an enlarged longitudinal sectional view showing an underground outer wall having a communication structure different from that in FIGS. 3A to 3C. It is a cross-sectional view which shows the wall main body of the underground outer wall which concerns on the modification of this invention. It is a cross-sectional view which shows the wall main body of the underground outer wall which concerns on the modification of this invention. It is a cross-sectional view which shows the wall main body of the underground outer wall which concerns on the modification of this invention. It is a cross-sectional view which shows the underground outer wall which concerns on the modification of this invention. It is a longitudinal cross-sectional view which shows the underground outer wall which concerns on the modification of this invention. It is a partial front view which shows the underground outer wall which concerns on the modification of this invention. It is sectional drawing obtained along the AA line of FIG. 7A.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In the present invention, the vertical direction (or longitudinal direction) of a steel sheet pile or the like refers to the direction in which the steel sheet pile is embedded in the ground (substantially vertical direction) unless otherwise specified.
FIG. 1 is a cross-sectional view showing an underground outer wall 1 according to an embodiment of the present invention. 2A and 2B are a cross-sectional view and a front view showing the underground outer wall 1.
1, 2 </ b> A, and 2 </ b> B have a wall structure that partitions a basement space S that is a space on the front side and a back ground G on the back side. The underground outer wall 1 has a wall body 3 composed of a plurality of steel sheet piles 2 embedded in the ground G. The basement space S is surrounded by the wall body 3 and is divided into upper and lower sections by the basement floor slab 4 and the first floor slab 5. And the drainage groove 41 is extended and formed in the position along the wall main body 3 in the basement floor slab 4. As shown in FIG.

In the present embodiment, the steel sheet pile 2 is manufactured by hot rolling, and a first flange 21 located at the center of the cross section, a pair of webs 22 connected to both side edges of the first flange 21, and the pair A hat shape having a pair of second flanges 23 extending from the leading edge of the web 22 in parallel and outward to the first flange 21, and a pair of joint portions 24 provided at the leading edges of the pair of second flanges 23. It is a steel sheet pile. Each of these steel sheet piles 2 is provided with a first flange 21 provided on the basement space S side and a pair of second flanges 23 positioned on the ground G side. And the adjacent steel sheet piles 2 are connected by fitting the joint parts 24 located in the ground G side, Thereby, the wall main body 3 is formed continuously.

The connecting member 6 joined to the second flange 23 of both the steel sheet piles 2 is along the longitudinal direction (vertical direction) of the steel sheet piles 2 on the basement space S side of the adjacent steel sheet piles 2 across the joint portion 24. Is provided. This connecting member 6 is made of a steel material (an angle steel, an angle material) having an L-shaped cross section, and is a welded joint part that is fillet welded to the cover part 61 that covers the front side of the joint part 24 and the second flange 23 of the steel sheet pile 2. 62. The connecting member 6 is provided with an angle material projecting toward the basement space S side. Thereby, a concealing space 63 is formed between the cover portion 61 and the adjacent second flange 23 and joint portion 24. Therefore, the joint part 24 becomes invisible from the basement space S side.

The welded joint 62 of the connecting member 6 is formed by fillet welding the open end edge of the angle member and the side surface of the second flange 23 of the steel sheet pile 2 from the basement space S side. That is, after the steel sheet pile 2 is embedded in the ground G, the ground on the basement space S side is excavated, and then the connecting member 6 is joined to the steel sheet pile 2 later. The weld joint 62 is provided intermittently along the longitudinal direction of the connecting member 6. The weld joint 62 may be provided continuously over substantially the entire length of the connecting member 6 in the longitudinal direction. As the weld length of the weld joint 62, a predetermined weld strength can be secured by the entire length. It may be longer than the length. As described above, by joining the connecting member 6 to the second flange 23 across the joint portion 24 of the adjacent steel sheet piles 2, the shear deformation between the adjacent steel sheet piles 2 is restricted by the connecting member 6.

Next, a communication structure between the lower end portion of the connecting member 6 and the drainage groove 41 of the basement floor slab 4 will be described with reference to FIGS. 3A to 3C.
3A to 3C are a cross-sectional view, a front view, and a vertical cross-sectional view showing the underground outer wall 1 in the vicinity of the basement floor slab 4 in an enlarged manner.
In the basement floor slab 4, the drainage groove 41 is formed on the basement space S side of the first flange 21 along the first flange 21 of the steel sheet pile 2 in the underground outer wall 1. And the basement floor slab 4 has the floor protrusion part 42 which entered and protruded into the part dented to the ground G side by the web 22 and the 2nd flange 23 of the steel sheet pile 2 and is formed.

The lower end portion of the connecting member 6 is provided in the vicinity of the upper surface position of the floor protruding portion 42. A communication groove 43 extending from the lower side of the connecting member 6 to the drainage groove 41 is formed on the upper surface of the floor protrusion 42. By this communication groove 43, the lower end portion of the concealing space 63 of the connecting member 6 and the drainage groove 41 are communicated. Therefore, even if the groundwater of the back ground G of the underground outer wall 1 oozes out from between the joint portions 24 of the steel sheet pile 2 to the basement space S side, the groundwater falls in the concealed space 63 and passes through the communication groove 43. It can be led to the drainage groove 41 and drained. That is, the concealed space 63 can also function as a vertical drain for drainage. Further, although depending on the amount of drainage, it is desirable to continuously weld the joints in order to exhibit the function as a dredge. Furthermore, it is desirable to adjust the weld leg length so as to ensure a necessary welding amount according to the shearing force.

In the present embodiment, the communication structure between the lower end portion of the connecting member 6 and the drainage groove 41 of the basement floor slab 4 is not limited to the above-described structure, and the structures shown in FIGS. 4A and 4B below can be adopted. .
As shown in FIGS. 4A and 4B, the floor protrusion 42 of the basement floor slab 4 may have an inclined surface 44 whose upper surface is inclined downward from the ground G side toward the basement space S side. In this case, the lower end portion of the connecting member 6 is positioned on the water side of the inclined surface 44, and the drainage groove 41 is provided continuously on the water side of the inclined surface 44. Accordingly, the groundwater that has oozed out from between the joint portions 24 of the steel sheet pile 2 falls from the concealed space 63 of the connecting member 6 to the inclined surface 44 and flows along the gradient of the inclined surface 44 to the drain groove 41 and is drained. The

According to the underground outer wall 1 of the present embodiment as described above, the following actions and effects can be obtained.
That is, by joining the connecting members 6 across the joint portions 24 in the adjacent steel sheet piles 2, shear deformation that causes the adjacent steel sheet piles 2 to deviate in the vertical direction is constrained, and from the plurality of connected steel sheet piles 2 The wall body 3 can be made to function as a seismic wall. Therefore, since the wall main body 3 can be used not as a temporary earth retaining wall but as a main wall structure, it is not necessary to construct an RC wall as in the prior art, and the construction cost can be greatly reduced. Furthermore, since the construction period for constructing the RC wall and the construction period for pulling out the temporary earth retaining can be eliminated, the construction period required for the underground construction can be greatly shortened and the earthquake resistance can be improved.

Moreover, since the connection member 6 is welded and joined to the basement space S side of the steel sheet pile 2, the welding operation can be carried out from the basement space S side, and the steel sheet pile 2 is embedded in the ground G and the basement space S side. After excavating the ground, the connecting member 6 can be joined by retrofitting. Therefore, since it is not necessary to provide an extra member protruding from the surface before embedding the steel sheet pile 2, an increase in embedding resistance of the steel sheet pile 2 can be prevented and good workability can be ensured. Furthermore, the welding operation of the connecting member 6 can be carried out with a good working posture, and the quality of the weld joint 62 can be ensured. Furthermore, since the connecting member 6 is joined to the second flange 23 at a position recessed to the ground G side by the hat-shaped steel sheet pile, the connecting member 6 is arranged using the unevenness of the steel sheet pile 2, and the connecting member 6 is The basement space S can be prevented from protruding toward the basement space S, and the basement space S can be effectively used.

Moreover, since the joint part 24 of the steel sheet pile 2 is covered from the basement space S side by the cover part 61 of the connecting member 6, the appearance of the underground outer wall 1 when viewed from the basement space S side can be improved. Furthermore, since the joint part 24 is concealed by the cover part 61, even if groundwater seeps out from the joint part 24 from the back ground G, it can be prevented from seeing out the groundwater from the basement space S side. 1 can be further improved in appearance.

Moreover, this welding part is easy to visually recognize from the basement space S side by welding the intersection position of the open end edge of the angle material which is the connection member 6, and the 2nd flange 23 side surface of the steel sheet pile 2 from the basement space S side. In addition, the welding rod can be inserted straight from the basement space S side in a lateral posture. Therefore, throat thickness management and strength management during welding can be easily and reliably performed, and workability can be improved while ensuring the strength of the weld joint 62.

In addition, this invention is not limited to the said embodiment, Including other structures etc. which can achieve the objective of this invention, the deformation | transformation etc. which are shown below are also contained in this invention.
For example, although the underground outer wall 1 has been described in the above embodiment, the wall structure of the present invention is not limited to the underground outer wall, but can be applied to a wall constructed on the ground. That is, the upper end portion of the steel sheet pile may be protruded from the ground surface to the ground, and the connecting member may be joined across the joint portion of the protruded steel sheet pile. There may be an appropriate back space such as an external space or an internal space. And also on the back side, the same connecting member as described above may be joined to the steel sheet pile.

Moreover, in the said embodiment, although the steel material of a cross-section L shape was utilized as the connection member 6 joined to the steel sheet pile 2, the shape of the connection member 6 is not specifically limited, A cross-section substantially U-shaped as shown to FIG. 5A. Any suitable member can be used, such as a connecting member 6A made of steel (channel steel, channel material) or a connecting member 6B made of a steel material (steel pipe, pipe) having a semi-cylindrical cross section as shown in FIG. 5B. Furthermore, as a steel sheet pile which comprises the wall main body 3, not only a hat-shaped steel sheet pile (steel sheet pile 2) but U-shaped steel sheet piles (1st steel sheet pile 2A and 2nd steel sheet pile 2B) as shown in FIG. 5C, Appropriate materials such as a Z-shaped steel sheet pile and an I-shaped steel sheet pile can be used.

Here, the modification shown in FIG. 5C will be described in detail. In FIG. 5C, the first steel sheet pile 2 </ b> A and the second steel sheet pile 2 </ b> B are each provided with a flange 25, a pair of webs 26 continuous with both side edges of the flange 25, and a pair provided at the leading edges of the pair of webs 26. This is a U-shaped steel sheet pile having a joint part 27. The first steel sheet pile 2A is provided with the flange 25 positioned on the ground G side which is the back side, and the second steel sheet pile 2B is provided with the flange 25 positioned on the basement space S side. These 1st and 2nd steel sheet piles 2A and 2B are connected by mutually adjoining and mutually fitting the joint part 27. FIG. And the connection member 6 is being fixed to the web 26 of the position which straddles the joint part 27 in the 1st and 2nd steel sheet piles 2A and 2B which adjoin each other.

Moreover, in the said embodiment, although the 2nd flange 23 and joint part 24 of the adjacent steel sheet pile 2 were arrange | positioned toward the ground G side, the installation direction of the steel sheet pile 2 is not specifically limited, The following FIG. 6A 6B, the 2nd flange 23 and the coupling part 24 may be arrange | positioned toward the basement space S side. In this case, since the connecting member 6 protrudes further to the basement space S side than the second flange 23 and is welded to the second flange 23, the connecting member 6 is located above the drainage groove 41. The groundwater that has fallen in the concealed space 63 flows into the communication groove 41 as it is.

Furthermore, you may form the opening part 7 in the part concealed with the connection member 6 among the 2nd flange part 23 (or web part 26) or the joint part 24 (or joint part 27). For example, as shown in FIGS. 7A and 7B, the round hole 71 may be formed in a portion of the second flange portion 23 that is concealed by the connecting member 6. According to this configuration, when the ground G contains a lot of moisture, the moisture can be discharged to the underground space S side. Although the magnitude | size of the opening part 7 is not specifically limited, It is preferable that it is a magnitude | size which does not leak earth and sand. With such a configuration, the function as a seismic wall and the function of relaxing the water pressure applied to the wall can be exhibited together. Moreover, since the moisture content of the ground is discharged from the opening, the ground can be maintained in a good state. The opening 7 may be a slit or a notch formed in the joint.

In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of materials, quantities, and other detailed configurations.
Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of some or all of such restrictions is included in this invention.

According to the present invention, an RC wall for resisting in-plane load at the time of an earthquake is not required, and a joint restraint means that allows easy construction and strength management so that an underground outer wall can be constructed with a steel sheet pile alone. In addition, it is possible to provide an underground outer wall structure having a function as a seismic wall and an underground outer wall structure capable of realizing a significant cost reduction. Therefore, industrial applicability is great.

DESCRIPTION OF SYMBOLS 1 ... Underground outer wall 2 ... Steel sheet pile 2A ... 1st steel sheet pile 2B ... 2nd steel sheet pile 3 ... Wall

main body

6, 6A, 6B ... Connection member 21 ... 1st flange 22 ... Web 23 ... 2nd flange 24 ... Joint part 25 ... Flange 26 ... Web 27 ... Fitting part 41 ... Drainage groove 61 ... Cover part 62 ... Welding joint 63 ... Concealment space G ... Ground S ... Basement space 7 ... Opening part 71 ... Round hole

Claims

A first steel sheet pile and a second steel sheet pile that are connected to each other by joint portions provided at the respective side edges and are embedded in the ground to partition the ground side and the basement space side;
A connecting member joined to both the first steel sheet pile and the second steel sheet pile so as to straddle the basement space side of the joint portion;
With
The underground outer wall structure characterized in that the connecting member is provided along the embedding direction of the first steel sheet pile and the second steel sheet pile.
The connecting member is
A pair of joints joined to each of the first steel sheet pile and the second steel sheet pile;
A cover portion covering the basement space side of the joint portion;
With
The underground outer wall structure according to claim 1, wherein a concealing space is formed between the cover portion and the joint portion.
The pair of joints are weld joints obtained by welding the first steel sheet pile and the second steel sheet pile and the connecting member, and embedding the first steel sheet pile and the second steel sheet pile. The underground outer wall structure according to claim 2, wherein the underground outer wall structure is provided continuously along a direction or intermittently along the embedding direction.
3. The underground outer wall structure according to claim 2, wherein the cover portion is a steel material having an L-shaped section, a U-shaped section, or a semi-cylindrical section.
A drainage groove extending in a direction substantially perpendicular to the embedding direction is provided at a predetermined height position on the basement space side of the first steel sheet pile and the second steel sheet pile, and a lower end portion of the concealing space is The underground outer wall structure according to claim 2, wherein the underground outer wall structure communicates with the drainage groove.
4. The underground outer wall structure according to claim 3, wherein the cover portion is a steel material having an L-shaped section, a U-shaped section, or a semi-cylindrical section.
A drainage groove extending in a direction substantially perpendicular to the embedding direction is provided at a predetermined height position on the basement space side of the first steel sheet pile and the second steel sheet pile, and a lower end portion of the concealing space is The underground outer wall structure according to claim 3, wherein the underground outer wall structure communicates with the drainage groove.
A drainage groove extending in a direction substantially perpendicular to the embedding direction is provided at a predetermined height position on the basement space side of the first steel sheet pile and the second steel sheet pile, and a lower end portion of the concealing space is The underground outer wall structure according to claim 4, wherein the underground outer wall structure is communicated with the drainage groove.
A drainage groove extending in a direction substantially perpendicular to the embedding direction is provided at a predetermined height position on the basement space side of the first steel sheet pile and the second steel sheet pile, and a lower end portion of the concealing space is The underground outer wall structure according to claim 5, wherein the underground outer wall structure communicates with the drainage groove.
A drainage groove extending in a direction substantially perpendicular to the embedding direction is provided at a predetermined height position on the basement space side of the first steel sheet pile and the second steel sheet pile, and a lower end portion of the concealing space is The underground outer wall structure according to claim 6, wherein the underground outer wall structure communicates with the drainage groove.
Each of the first steel sheet pile and the second steel sheet pile is
A first flange provided on the basement space side;
A pair of webs connected to both side edges of the first flange;
A pair of second flanges extending substantially parallel to the first flange from the leading edges of the pair of webs and extending outward, and located on the ground side;
A hat-shaped steel sheet pile in which the pair of joint portions are provided at the end edges of the pair of second flanges,
The underground outer wall structure according to any one of claims 1 to 10, wherein the connecting member is joined to the second flange.
Each of the first steel sheet pile and the second steel sheet pile is
A first flange provided on the ground side;
A pair of webs connected to both side edges of the first flange;
A pair of second flanges extending substantially parallel to the first flange from the leading edges of the pair of webs and extending outward and provided on the basement space side;
A hat-shaped steel sheet pile in which the pair of joint portions are provided at the end edges of the pair of second flanges,
The underground outer wall structure according to any one of claims 1 to 10, wherein the connecting member is joined to the second flange.
The first steel sheet pile is
A first flange provided on the ground side;
A pair of first webs connected to both side edges of the first flange;
A first U-shaped steel sheet pile in which the pair of joint portions are provided at the leading edges of the pair of first webs,
The second steel sheet pile is
A second flange provided on the basement space side;
A pair of second webs connected to both side edges of the second flange;
A second U-shaped steel sheet pile in which the pair of joint portions are provided at the tip edges of the pair of second webs,
The underground outer wall structure according to any one of claims 1 to 10, wherein the connecting member is joined to the first web and the second web.